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Jeopardy Rules

Jeopardy Rules. Teams: Raise your hand to be called upon. Each team takes turns, alternating between teams. The same person can not answer twice in a row. Everyone keeps their own score on the score sheet provided. Click on the Star at the bottom right corner for Double Jeopardy.

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Arid Ecosystems

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Desertification

Desertification. Desertification in the Sahel source: NASA Earth Observatory . What is a desert?. Deserts cover about one fifth of the Earth's surface and occur where rainfall is less than 50 cm/year. . World desert's map. Distribution of non-polar arid land. Source: USGS .

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